package postgres

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"time"

	"cmr-backend/internal/apperr"

	"github.com/jackc/pgx/v5"
)

type SMSCodeMeta struct {
	ID            string
	CodeHash      string
	ExpiresAt     time.Time
	CooldownUntil time.Time
}

type CreateSMSCodeParams struct {
	Scene         string
	CountryCode   string
	Mobile        string
	ClientType    string
	DeviceKey     string
	CodeHash      string
	ProviderName  string
	ProviderDebug map[string]any
	ExpiresAt     time.Time
	CooldownUntil time.Time
}

type CreateMobileIdentityParams struct {
	UserID       string
	IdentityType string
	Provider     string
	ProviderSubj string
	CountryCode  string
	Mobile       string
}

type CreateIdentityParams struct {
	UserID       string
	IdentityType string
	Provider     string
	ProviderSubj string
	CountryCode  *string
	Mobile       *string
	ProfileJSON  string
}

type CreateRefreshTokenParams struct {
	UserID     string
	ClientType string
	DeviceKey  string
	TokenHash  string
	ExpiresAt  time.Time
}

type RefreshTokenRecord struct {
	ID         string
	UserID     string
	ClientType string
	DeviceKey  *string
	ExpiresAt  time.Time
	IsRevoked  bool
}

func (s *Store) GetLatestSMSCodeMeta(ctx context.Context, countryCode, mobile, clientType, scene string) (*SMSCodeMeta, error) {
	row := s.pool.QueryRow(ctx, `
		SELECT id, code_hash, expires_at, cooldown_until
		FROM auth_sms_codes
		WHERE country_code = $1 AND mobile = $2 AND client_type = $3 AND scene = $4
		ORDER BY created_at DESC
		LIMIT 1
	`, countryCode, mobile, clientType, scene)

	var record SMSCodeMeta
	err := row.Scan(&record.ID, &record.CodeHash, &record.ExpiresAt, &record.CooldownUntil)
	if errors.Is(err, pgx.ErrNoRows) {
		return nil, nil
	}
	if err != nil {
		return nil, fmt.Errorf("query latest sms code meta: %w", err)
	}
	return &record, nil
}

func (s *Store) CreateSMSCode(ctx context.Context, params CreateSMSCodeParams) error {
	payload, err := json.Marshal(map[string]any{
		"provider": params.ProviderName,
		"debug":    params.ProviderDebug,
	})
	if err != nil {
		return err
	}

	_, err = s.pool.Exec(ctx, `
		INSERT INTO auth_sms_codes (
			scene, country_code, mobile, client_type, device_key, code_hash,
			provider_payload_jsonb, expires_at, cooldown_until
		)
		VALUES ($1, $2, $3, $4, $5, $6, $7::jsonb, $8, $9)
	`, params.Scene, params.CountryCode, params.Mobile, params.ClientType, params.DeviceKey, params.CodeHash, string(payload), params.ExpiresAt, params.CooldownUntil)
	if err != nil {
		return fmt.Errorf("insert sms code: %w", err)
	}
	return nil
}

func (s *Store) GetLatestValidSMSCode(ctx context.Context, countryCode, mobile, clientType, scene string) (*SMSCodeMeta, error) {
	row := s.pool.QueryRow(ctx, `
		SELECT id, code_hash, expires_at, cooldown_until
		FROM auth_sms_codes
		WHERE country_code = $1
		  AND mobile = $2
		  AND client_type = $3
		  AND scene = $4
		  AND consumed_at IS NULL
		  AND expires_at > NOW()
		ORDER BY created_at DESC
		LIMIT 1
	`, countryCode, mobile, clientType, scene)

	var record SMSCodeMeta
	err := row.Scan(&record.ID, &record.CodeHash, &record.ExpiresAt, &record.CooldownUntil)
	if errors.Is(err, pgx.ErrNoRows) {
		return nil, nil
	}
	if err != nil {
		return nil, fmt.Errorf("query latest valid sms code: %w", err)
	}
	return &record, nil
}

func (s *Store) ConsumeSMSCode(ctx context.Context, tx Tx, id string) (bool, error) {
	commandTag, err := tx.Exec(ctx, `
		UPDATE auth_sms_codes
		SET consumed_at = NOW()
		WHERE id = $1 AND consumed_at IS NULL
	`, id)
	if err != nil {
		return false, fmt.Errorf("consume sms code: %w", err)
	}
	return commandTag.RowsAffected() == 1, nil
}

func (s *Store) CreateMobileIdentity(ctx context.Context, tx Tx, params CreateMobileIdentityParams) error {
	countryCode := params.CountryCode
	mobile := params.Mobile
	return s.CreateIdentity(ctx, tx, CreateIdentityParams{
		UserID:       params.UserID,
		IdentityType: params.IdentityType,
		Provider:     params.Provider,
		ProviderSubj: params.ProviderSubj,
		CountryCode:  &countryCode,
		Mobile:       &mobile,
		ProfileJSON:  "{}",
	})
}

func (s *Store) CreateIdentity(ctx context.Context, tx Tx, params CreateIdentityParams) error {
	_, err := tx.Exec(ctx, `
		INSERT INTO login_identities (
			user_id, identity_type, provider, provider_subject, country_code, mobile, status, profile_jsonb
		)
		VALUES ($1, $2, $3, $4, $5, $6, 'active', $7::jsonb)
		ON CONFLICT (provider, provider_subject) DO NOTHING
	`, params.UserID, params.IdentityType, params.Provider, params.ProviderSubj, params.CountryCode, params.Mobile, zeroJSON(params.ProfileJSON))
	if err != nil {
		return fmt.Errorf("create identity: %w", err)
	}
	return nil
}

func (s *Store) FindUserByProviderSubject(ctx context.Context, tx Tx, provider, providerSubject string) (*User, error) {
	row := tx.QueryRow(ctx, `
		SELECT u.id, u.user_public_id, u.status, u.nickname, u.avatar_url
		FROM users u
		JOIN login_identities li ON li.user_id = u.id
		WHERE li.provider = $1
		  AND li.provider_subject = $2
		  AND li.status = 'active'
		LIMIT 1
	`, provider, providerSubject)
	return scanUser(row)
}

func (s *Store) CreateRefreshToken(ctx context.Context, tx Tx, params CreateRefreshTokenParams) (string, error) {
	row := tx.QueryRow(ctx, `
		INSERT INTO auth_refresh_tokens (user_id, client_type, device_key, token_hash, expires_at)
		VALUES ($1, $2, NULLIF($3, ''), $4, $5)
		RETURNING id
	`, params.UserID, params.ClientType, params.DeviceKey, params.TokenHash, params.ExpiresAt)

	var id string
	if err := row.Scan(&id); err != nil {
		return "", fmt.Errorf("create refresh token: %w", err)
	}
	return id, nil
}

func (s *Store) GetRefreshTokenForUpdate(ctx context.Context, tx Tx, tokenHash string) (*RefreshTokenRecord, error) {
	row := tx.QueryRow(ctx, `
		SELECT id, user_id, client_type, device_key, expires_at, revoked_at IS NOT NULL
		FROM auth_refresh_tokens
		WHERE token_hash = $1
		FOR UPDATE
	`, tokenHash)

	var record RefreshTokenRecord
	err := row.Scan(&record.ID, &record.UserID, &record.ClientType, &record.DeviceKey, &record.ExpiresAt, &record.IsRevoked)
	if errors.Is(err, pgx.ErrNoRows) {
		return nil, nil
	}
	if err != nil {
		return nil, fmt.Errorf("query refresh token for update: %w", err)
	}
	return &record, nil
}

func (s *Store) RotateRefreshToken(ctx context.Context, tx Tx, oldTokenID, newTokenID string) error {
	_, err := tx.Exec(ctx, `
		UPDATE auth_refresh_tokens
		SET revoked_at = NOW(), replaced_by_token_id = $2
		WHERE id = $1
	`, oldTokenID, newTokenID)
	if err != nil {
		return fmt.Errorf("rotate refresh token: %w", err)
	}
	return nil
}

func (s *Store) RevokeRefreshToken(ctx context.Context, tokenHash string) error {
	commandTag, err := s.pool.Exec(ctx, `
		UPDATE auth_refresh_tokens
		SET revoked_at = COALESCE(revoked_at, NOW())
		WHERE token_hash = $1
	`, tokenHash)
	if err != nil {
		return fmt.Errorf("revoke refresh token: %w", err)
	}
	if commandTag.RowsAffected() == 0 {
		return apperr.New(http.StatusNotFound, "refresh_token_not_found", "refresh token not found")
	}
	return nil
}

func (s *Store) RevokeRefreshTokensByUserID(ctx context.Context, tx Tx, userID string) error {
	_, err := tx.Exec(ctx, `
		UPDATE auth_refresh_tokens
		SET revoked_at = COALESCE(revoked_at, NOW())
		WHERE user_id = $1
	`, userID)
	if err != nil {
		return fmt.Errorf("revoke refresh tokens by user id: %w", err)
	}
	return nil
}

func (s *Store) TransferNonMobileIdentities(ctx context.Context, tx Tx, sourceUserID, targetUserID string) error {
	if sourceUserID == targetUserID {
		return nil
	}

	_, err := tx.Exec(ctx, `
		INSERT INTO login_identities (
			user_id, identity_type, provider, provider_subject, country_code, mobile, status, profile_jsonb, created_at, updated_at
		)
		SELECT
			$2,
			li.identity_type,
			li.provider,
			li.provider_subject,
			li.country_code,
			li.mobile,
			li.status,
			li.profile_jsonb,
			li.created_at,
			li.updated_at
		FROM login_identities li
		WHERE li.user_id = $1
		  AND li.provider <> 'mobile'
		ON CONFLICT (provider, provider_subject) DO NOTHING
	`, sourceUserID, targetUserID)
	if err != nil {
		return fmt.Errorf("copy non-mobile identities: %w", err)
	}

	_, err = tx.Exec(ctx, `
		DELETE FROM login_identities
		WHERE user_id = $1
		  AND provider <> 'mobile'
	`, sourceUserID)
	if err != nil {
		return fmt.Errorf("delete source non-mobile identities: %w", err)
	}

	return nil
}

func zeroJSON(value string) string {
	if value == "" {
		return "{}"
	}
	return value
}